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Ottawa Fire Department spokesman Marc Messier said the OFM has wrapped up its investigation at the 1518 Stittsville Main St. heritage building. The electrical failure is believed to have originated in the southwest corner of the unoccupied attic.

Messier said it's difficult to determine what causes electrical malfunctions.

"Let's say we believe it was a toaster," he said. "In this case, it wasn't a toaster, but when there is an electrical malfunction it can be the toaster itself, the cord or the outlet. It's hard to know which part is the one which failed."

The fire at the century-old building caused more than $800,000 damage and closed the main street in the village for about 24 hours.

doug.hempstead@sunmedia.ca

Twitter: @DougHempstead

Fire heavily damages historic Stittsville building

Firefighters battle a blaze in a historic building at 1518 Stittsville Main St., on Monday, Sept. 9, 2013. Volunteer firefighters who happened to be in the area saw the smoke and evacuated several people. (KOMALJIT MINHAS Submitted image)

Firefighters battle a blaze in a historic building at 1518 Stittsville Main St., on Monday, Sept. 9, 2013. Volunteer firefighters who happened to be in the area saw the smoke and evacuated several people. (DOUG HEMPSTEAD Ottawa Sun)

Firefighters battle a blaze in a historic building at 1518 Stittsville Main St., on Monday, Sept. 9, 2013. Volunteer firefighters who happened to be in the area saw the smoke and evacuated several people. (DOUG HEMPSTEAD Ottawa Sun)

Firefighters battle a blaze in a historic building at 1518 Stittsville Main St., on Monday, Sept. 9, 2013. Volunteer firefighters who happened to be in the area saw the smoke and evacuated several people. (DOUG HEMPSTEAD Ottawa Sun)

Firefighters battle a blaze in a historic building at 1518 Stittsville Main St., on Monday, Sept. 9, 2013. Volunteer firefighters who happened to be in the area saw the smoke and evacuated several people. (DOUG HEMPSTEAD Ottawa Sun)

Firefighters battle a blaze in a historic building at 1518 Stittsville Main St., on Monday, Sept. 9, 2013. Volunteer firefighters who happened to be in the area saw the smoke and evacuated several people. (DOUG HEMPSTEAD Ottawa Sun)

Fire crews battle a smoky blaze in a building at 1518 Stittsville Main St., on Monday, Sept. 9, 2013. There were no immediate reports of injuries. (NEIL KEOHANE Submitted image)

Firefighters battle a blaze in a historic building at 1518 Stittsville Main St., on Monday, Sept. 9, 2013. Volunteer firefighters who happened to be in the area saw the smoke and evacuated several people. (KOMALJIT MINHAS Submitted image)

OTTAWA (09/09/13) � Firefighters battled a stubborn blaze Monday afternoon at a Stittsville landmark � the former Bradley's General Store. The building, currently home to a pub, dentist office and apartments, will have to be entirely gutted and renovated. Dpug Hempstead/Ottawa Sun/QMI Agency

QMI

OTTAWA (09/09/13) � Firefighters battled a stubborn blaze Monday afternoon at a Stittsville landmark � the former Bradley's General Store. The building, currently home to a pub, dentist office and apartments, will have to be entirely gutted and renovated. Dpug Hempstead/Ottawa Sun/QMI Agency

QMI

OTTAWA (09/09/13) � Firefighters battled a stubborn blaze Monday afternoon at a Stittsville landmark � the former Bradley's General Store. The building, currently home to a pub, dentist office and apartments, will have to be entirely gutted and renovated. Dpug Hempstead/Ottawa Sun/QMI Agency

QMI

OTTAWA (09/09/13) � Firefighters battled a stubborn blaze Monday afternoon at a Stittsville landmark � the former Bradley's General Store. The building, currently home to a pub, dentist office and apartments, will have to be entirely gutted and renovated. Dpug Hempstead/Ottawa Sun/QMI Agency

QMI

Firefighters battled a stubborn blaze Monday afternoon at a Stittsville landmark — the former Bradley's General Store. The building, currently home to a pub, dentist office and apartments, will have to be entirely gutted and renovated. (AINSLEY MITCHELL Submitted image)

Firefighters battled a stubborn blaze Monday afternoon at a Stittsville landmark — the former Bradley's General Store. The building, currently home to a pub, dentist office and apartments, will have to be entirely gutted and renovated. (AINSLEY MITCHELL Submitted image)

Firefighters battled a stubborn blaze Monday afternoon at a Stittsville landmark — the former Bradley's General Store. The building, currently home to a pub, dentist office and apartments, will have to be entirely gutted and renovated. (AINSLEY MITCHELL Submitted image)

Firefighters battled a stubborn blaze Monday afternoon at a Stittsville landmark — the former Bradley's General Store. The building, currently home to a pub, dentist office and apartments, will have to be entirely gutted and renovated. (JAMIE BUDER Submitted image)

Firefighters battled a stubborn blaze Monday afternoon at a Stittsville landmark — the former Bradley's General Store. The building, currently home to a pub, dentist office and apartments, will have to be entirely gutted and renovated. (JAMIE BUDER Submitted image)

Firefighters battled a stubborn blaze Monday afternoon at a Stittsville landmark — the former Bradley's General Store. The building, currently home to a pub, dentist office and apartments, will have to be entirely gutted and renovated. (JAMIE BUDER Submitted image)

Firefighters battled a stubborn blaze Monday afternoon at a Stittsville landmark — the former Bradley's General Store. The building, currently home to a pub, dentist office and apartments, will have to be entirely gutted and renovated. (JAMIE BUDER Submitted image)